Miami's CB rotation

Despite some massive expenditures elsewhere on the roster this offseason, the Miami Dolphins addressed their need at CB with a mere one-year, $5.5 million contract on Brent Grimes; of course, they did snatch up two more CBs early in the draft with Jamar Taylor (Round 2, No. 54 overall) and Will Davis (Round 3, No. 93 overall). This group of four joins holdovers Richard Marshall, Nolan Carroll and Dimitri Patterson. So how is the group shaping up?